Martin Truex Jr. will have a new crew chief beginning this weekend at Pocono Raceway.
Lead engineer Chad Johnston is replacing Pat Tryson as crew chief of Truex's No. 56 Toyota.
Truex has had a rough start to the season. He's 21st in the Sprint Cup standings with just three top-10 finishes.
He angrily fired his crew over his team radio following a botched final pit stop at Richmond, and that led to changes on his over-the-wall team the next week.